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new: 映射vma
This commit is contained in:
parent
8d39334e39
commit
51bc465a25
@ -78,7 +78,7 @@ ul round(double x)
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* @param _align
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* @return ul 对齐后的地址
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*/
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ul ALIGN(const ul addr, const ul _align)
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static __always_inline ul ALIGN(const ul addr, const ul _align)
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{
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return (ul)((addr + _align - 1) & (~(_align - 1)));
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}
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@ -2,7 +2,7 @@
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CFLAGS += -I .
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all:mm.o slab.o mm-stat.o vma.o mmap.o
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all:mm.o slab.o mm-stat.o vma.o mmap.o utils.o
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mm.o: mm.c
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gcc $(CFLAGS) -c mm.c -o mm.o
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@ -18,3 +18,6 @@ vma.o: vma.c
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mmap.o: mmap.c
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gcc $(CFLAGS) -c mmap.c -o mmap.o
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utils.o: utils.c
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gcc $(CFLAGS) -c utils.c -o utils.o
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29
kernel/mm/internal.h
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29
kernel/mm/internal.h
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@ -0,0 +1,29 @@
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#pragma once
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#include "mm.h"
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/**
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* @brief 将vma结构体插入mm_struct的链表之中
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*
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* @param mm 内存空间分布结构体
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* @param vma 待插入的VMA结构体
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* @param prev 链表的前一个结点
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*/
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void __vma_link_list(struct mm_struct * mm, struct vm_area_struct * vma, struct vm_area_struct * prev);
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/**
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* @brief 将vma给定结构体从vma链表的结点之中删除
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*
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* @param mm 内存空间分布结构体
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* @param vma 待插入的VMA结构体
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*/
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void __vma_unlink_list(struct mm_struct * mm, struct vm_area_struct * vma);
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/**
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* @brief 获取指定虚拟地址处映射的物理地址
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*
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* @param mm 内存空间分布结构体
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* @param vaddr 虚拟地址
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* @return uint64_t 已映射的物理地址
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*/
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uint64_t __mm_get_paddr(struct mm_struct * mm, uint64_t vaddr);
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@ -2,6 +2,7 @@
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#include <common/glib.h>
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struct mm_struct;
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typedef uint64_t vm_flags_t;
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/**
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* @brief 内存页表结构体
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@ -33,13 +34,13 @@ typedef struct
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*/
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struct vm_area_struct
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{
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struct List list; // 循环链表结构体
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struct vm_area_struct *vm_prev, *vm_next;
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// 虚拟内存区域的范围是一个左闭右开的区间:[vm_start, vm_end)
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uint64_t vm_start; // 区域的起始地址
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uint64_t vm_end; // 区域的结束地址
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struct mm_struct *vm_mm; // 虚拟内存区域对应的mm结构体
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uint64_t vm_flags; // 虚拟内存区域的标志位, 具体可选值请见mm.h
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vm_flags_t vm_flags; // 虚拟内存区域的标志位, 具体可选值请见mm.h
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struct vm_operations_t *vm_ops; // 操作方法
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uint64_t ref_count; // 引用计数
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@ -110,7 +110,6 @@ void mm_init()
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// 初始化bitmap, 先将整个bmp空间全部置位。稍后再将可用物理内存页复位。
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memset(memory_management_struct.bmp, 0xff, memory_management_struct.bmp_len);
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io_mfence();
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kdebug("1212112");
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// 初始化内存页结构
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// 将页结构映射于bmp之后
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memory_management_struct.pages_struct = (struct Page *)(((unsigned long)memory_management_struct.bmp + memory_management_struct.bmp_len + PAGE_4K_SIZE - 1) & PAGE_4K_MASK);
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@ -120,7 +119,6 @@ void mm_init()
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// 将pages_struct全部清空,以备后续初始化
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memset(memory_management_struct.pages_struct, 0x00, memory_management_struct.pages_struct_len); // init pages memory
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kdebug("ffff");
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io_mfence();
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// 初始化内存区域
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memory_management_struct.zones_struct = (struct Zone *)(((ul)memory_management_struct.pages_struct + memory_management_struct.pages_struct_len + PAGE_4K_SIZE - 1) & PAGE_4K_MASK);
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@ -618,65 +616,3 @@ uint64_t mm_do_brk(uint64_t old_brk_end_addr, int64_t offset)
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return end_addr;
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}
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/**
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* @brief 检测指定地址是否已经被映射
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*
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* @param page_table_phys_addr 页表的物理地址
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* @param virt_addr 要检测的地址
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* @return true 已经被映射
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* @return false
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*/
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bool mm_check_mapped(ul page_table_phys_addr, uint64_t virt_addr)
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{
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ul *tmp;
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tmp = phys_2_virt((ul *)((ul)page_table_phys_addr & (~0xfffUL)) + ((virt_addr >> PAGE_GDT_SHIFT) & 0x1ff));
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// pml4页表项为0
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if (*tmp == 0)
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return 0;
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tmp = phys_2_virt((ul *)(*tmp & (~0xfffUL)) + ((virt_addr >> PAGE_1G_SHIFT) & 0x1ff));
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// pdpt页表项为0
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if (*tmp == 0)
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return 0;
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// 读取pdt页表项
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tmp = phys_2_virt(((ul *)(*tmp & (~0xfffUL)) + (((ul)(virt_addr) >> PAGE_2M_SHIFT) & 0x1ff)));
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// pde页表项为0
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if (*tmp == 0)
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return 0;
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if (*tmp & (1 << 7))
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{
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// 当前为2M物理页
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return true;
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}
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else
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{
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// 存在4级页表
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tmp = phys_2_virt(((ul *)(*tmp & (~0xfffUL)) + (((ul)(virt_addr) >> PAGE_4K_SHIFT) & 0x1ff)));
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if (*tmp != 0)
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return true;
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else
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return false;
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}
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}
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/**
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* @brief 检测是否为有效的2M页(物理内存页)
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*
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* @param paddr 物理地址
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* @return int8_t 是 -> 1
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* 否 -> 0
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*/
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int8_t mm_is_2M_page(uint64_t paddr)
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{
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if (likely((paddr >> PAGE_2M_SHIFT) < mm_total_2M_pages))
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return 1;
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else
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return 0;
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}
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// #pragma GCC pop_options
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@ -381,6 +381,7 @@ ul set_page_attr(struct Page *page, ul flags);
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#define VM_IO (1 << 4) // MMIO的内存区域
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#define VM_SOFTDIRTY (1 << 5)
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#define VM_MAYSHARE (1 << 6) // 该vma可被共享
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#define VM_USER (1 << 7) // 该vma可被用户态访问
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/* VMA basic access permission flags */
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#define VM_ACCESS_FLAGS (VM_READ | VM_WRITE | VM_EXEC)
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@ -396,7 +397,6 @@ static inline void vma_init(struct vm_area_struct *vma, struct mm_struct *mm)
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memset(vma, 0, sizeof(struct vm_area_struct));
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vma->vm_mm = mm;
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vma->vm_ops = NULL;
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list_init(&vma->list);
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}
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/**
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@ -422,15 +422,15 @@ static inline bool vma_is_accessible(struct vm_area_struct *vma)
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/**
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* @brief 获取一块新的vma结构体,并将其与指定的mm进行绑定
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*
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*
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* @param mm 与VMA绑定的内存空间分布结构体
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* @return struct vm_area_struct* 新的VMA
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*/
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struct vm_area_struct * vm_area_alloc(struct mm_struct *mm);
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struct vm_area_struct *vm_area_alloc(struct mm_struct *mm);
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/**
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* @brief 释放vma结构体
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*
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*
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* @param vma 待释放的vma结构体
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*/
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void vm_area_free(struct vm_area_struct *vma);
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@ -489,14 +489,29 @@ void mm_unmap_proc_table(ul proc_page_table_addr, bool is_phys, ul virt_addr_sta
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})
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/**
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* @brief 检测指定地址是否已经被映射
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* @brief 创建VMA,并将物理地址映射到指定的虚拟地址处
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*
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* @param page_table_phys_addr 页表的物理地址
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* @param virt_addr 要检测的地址
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* @return true 已经被映射
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* @return false
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* @param mm 要绑定的内存空间分布结构体
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* @param vaddr 起始虚拟地址
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* @param length 长度(字节)
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* @param paddr 起始物理地址
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* @param vm_flags vma的标志
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* @param vm_ops vma的操作接口
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* @return int 错误码
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*/
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bool mm_check_mapped(ul page_table_phys_addr, uint64_t virt_addr);
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int mm_map_vma(struct mm_struct *mm, uint64_t vaddr, uint64_t length, uint64_t paddr, vm_flags_t vm_flags, struct vm_operations_t *vm_ops);
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/**
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* @brief 在页表中取消指定的vma的映射
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*
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* @param mm 指定的mm
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* @param vma 待取消映射的vma
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* @param paddr 返回的被取消映射的起始物理地址
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* @return int 返回码
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*/
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int mm_umap_vma(struct mm_struct *mm, struct vm_area_struct * vma, uint64_t *paddr);
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/**
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* @brief 检测是否为有效的2M页(物理内存页)
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104
kernel/mm/mmap.c
104
kernel/mm/mmap.c
@ -1,5 +1,6 @@
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#include "mm.h"
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#include "slab.h"
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#include "internal.h"
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#include <common/compiler.h>
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extern uint64_t mm_total_2M_pages;
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@ -72,10 +73,16 @@ int mm_map_proc_page_table(ul proc_page_table_addr, bool is_phys, ul virt_addr_s
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// 计算线性地址对应的pml4页表项的地址
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mm_pgt_entry_num_t pgt_num;
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mm_calculate_entry_num(length, &pgt_num);
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// kdebug("ent1=%d ent2=%d ent3=%d, ent4=%d", pgt_num.num_PML4E, pgt_num.num_PDPTE, pgt_num.num_PDE, pgt_num.num_PTE);
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// 已映射的内存大小
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uint64_t length_mapped = 0;
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// 对user标志位进行校正
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if (flags & PAGE_U_S)
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user = true;
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else
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user = false;
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uint64_t pml4e_id = ((virt_addr_start >> PAGE_GDT_SHIFT) & 0x1ff);
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uint64_t *pml4_ptr;
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if (is_phys)
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@ -192,7 +199,6 @@ failed:;
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return -EFAULT;
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}
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/**
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* @brief 从页表中清除虚拟地址的映射
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*
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@ -262,7 +268,7 @@ void mm_unmap_proc_table(ul proc_page_table_addr, bool is_phys, ul virt_addr_sta
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ul *pde_ptr = pd_ptr + pde_id;
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// 存在4级页表
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if (unlikely(((*pde_ptr) & (1 << 7)) == 0))
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if (((*pde_ptr) & (1 << 7)) == 0)
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{
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// 存在4K页
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uint64_t pte_id = (((virt_addr_start + length_unmapped) >> PAGE_4K_SHIFT) & 0x1ff);
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@ -291,7 +297,7 @@ void mm_unmap_proc_table(ul proc_page_table_addr, bool is_phys, ul virt_addr_sta
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// 3级页表已经空了,释放页表
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if (unlikely(mm_check_page_table(pd_ptr)) == 0)
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kfree(pd_ptr);
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kfree(pd_ptr);
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}
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// 2级页表已经空了,释放页表
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if (unlikely(mm_check_page_table(pdpt_ptr)) == 0)
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@ -299,3 +305,93 @@ void mm_unmap_proc_table(ul proc_page_table_addr, bool is_phys, ul virt_addr_sta
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}
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flush_tlb();
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}
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/**
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* @brief 创建VMA,并将物理地址映射到指定的虚拟地址处
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*
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* @param mm 要绑定的内存空间分布结构体
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* @param vaddr 起始虚拟地址
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* @param length 长度(字节)
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* @param paddr 起始物理地址
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* @param vm_flags vma的标志
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* @param vm_ops vma的操作接口
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* @return int 错误码
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*/
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int mm_map_vma(struct mm_struct *mm, uint64_t vaddr, uint64_t length, uint64_t paddr, vm_flags_t vm_flags, struct vm_operations_t *vm_ops)
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{
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int retval = 0;
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struct vm_area_struct *vma = vm_area_alloc(mm);
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if (unlikely(vma == NULL))
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return -ENOMEM;
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vma->vm_ops = vm_ops;
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vma->vm_flags = vm_flags;
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vma->vm_start = vaddr;
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vma->vm_end = vaddr + length;
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// 将VMA加入链表
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__vma_link_list(mm, vma, mm->vmas);
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uint64_t len_4k = length % PAGE_2M_SIZE;
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uint64_t len_2m = length - len_4k;
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// ==== 将地址映射到页表
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/*
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todo: 限制页面的读写权限
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*/
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// 先映射2M页
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if (likely(len_2m > 0))
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{
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uint64_t page_flags = 0;
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if (vm_flags & VM_USER)
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page_flags = PAGE_USER_PAGE;
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else
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page_flags = PAGE_KERNEL_PAGE;
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// 这里直接设置user标志位为false,因为该函数内部会对其进行自动校正
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retval = mm_map_proc_page_table((uint64_t)mm->pgd, true, vaddr, paddr, len_2m, page_flags, false, false, false);
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if (unlikely(retval != 0))
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goto failed;
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}
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if (likely(len_4k > 0))
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{
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len_4k = ALIGN(len_4k, PAGE_4K_SIZE);
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uint64_t page_flags = 0;
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if (vm_flags & VM_USER)
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page_flags = PAGE_USER_4K_PAGE;
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else
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page_flags = PAGE_KERNEL_4K_PAGE;
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// 这里直接设置user标志位为false,因为该函数内部会对其进行自动校正
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retval = mm_map_proc_page_table((uint64_t)mm->pgd, true, vaddr + len_2m, paddr + len_2m, len_4k, page_flags, false, false, true);
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if (unlikely(retval != 0))
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goto failed;
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}
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flush_tlb();
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return 0;
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failed:;
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__vma_unlink_list(mm, vma);
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vm_area_free(vma);
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return retval;
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}
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/**
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* @brief 在页表中取消指定的vma的映射
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*
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* @param mm 指定的mm
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* @param vma 待取消映射的vma
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* @param paddr 返回的被取消映射的起始物理地址
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* @return int 返回码
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*/
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int mm_umap_vma(struct mm_struct *mm, struct vm_area_struct *vma, uint64_t *paddr)
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{
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// 确保vma对应的mm与指定的mm相一致
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if (unlikely(vma->vm_mm != mm))
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return -EINVAL;
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if (paddr != NULL)
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*paddr = __mm_get_paddr(mm, vma->vm_start);
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mm_unmap_proc_table((uint64_t)mm->pgd, true, vma->vm_start, vma->vm_end - vma->vm_start);
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return 0;
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}
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109
kernel/mm/utils.c
Normal file
109
kernel/mm/utils.c
Normal file
@ -0,0 +1,109 @@
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#include "internal.h"
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extern uint64_t mm_total_2M_pages;
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/**
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* @brief 获取指定虚拟地址处映射的物理地址
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*
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* @param mm 内存空间分布结构体
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* @param vaddr 虚拟地址
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* @return uint64_t 已映射的物理地址
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*/
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uint64_t __mm_get_paddr(struct mm_struct *mm, uint64_t vaddr)
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{
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ul *tmp;
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tmp = phys_2_virt((ul *)(((ul)mm->pgd) & (~0xfffUL)) + ((vaddr >> PAGE_GDT_SHIFT) & 0x1ff));
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// pml4页表项为0
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||||
if (*tmp == 0)
|
||||
return 0;
|
||||
|
||||
tmp = phys_2_virt((ul *)(*tmp & (~0xfffUL)) + ((vaddr >> PAGE_1G_SHIFT) & 0x1ff));
|
||||
|
||||
// pdpt页表项为0
|
||||
if (*tmp == 0)
|
||||
return 0;
|
||||
|
||||
// 读取pdt页表项
|
||||
tmp = phys_2_virt(((ul *)(*tmp & (~0xfffUL)) + (((ul)(vaddr) >> PAGE_2M_SHIFT) & 0x1ff)));
|
||||
|
||||
// pde页表项为0
|
||||
if (*tmp == 0)
|
||||
return 0;
|
||||
|
||||
if (*tmp & (1 << 7))
|
||||
{
|
||||
// 当前为2M物理页
|
||||
return (*tmp) & (~0x1fffUL);
|
||||
}
|
||||
else
|
||||
{
|
||||
// 存在4级页表
|
||||
tmp = phys_2_virt(((ul *)(*tmp & (~0xfffUL)) + (((ul)(vaddr) >> PAGE_4K_SHIFT) & 0x1ff)));
|
||||
|
||||
return (*tmp) & (~0x1ffUL);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief 检测指定地址是否已经被映射
|
||||
*
|
||||
* @param page_table_phys_addr 页表的物理地址
|
||||
* @param virt_addr 要检测的地址
|
||||
* @return true 已经被映射
|
||||
* @return false
|
||||
*/
|
||||
bool mm_check_mapped(ul page_table_phys_addr, uint64_t virt_addr)
|
||||
{
|
||||
ul *tmp;
|
||||
|
||||
tmp = phys_2_virt((ul *)((ul)page_table_phys_addr & (~0xfffUL)) + ((virt_addr >> PAGE_GDT_SHIFT) & 0x1ff));
|
||||
|
||||
// pml4页表项为0
|
||||
if (*tmp == 0)
|
||||
return 0;
|
||||
|
||||
tmp = phys_2_virt((ul *)(*tmp & (~0xfffUL)) + ((virt_addr >> PAGE_1G_SHIFT) & 0x1ff));
|
||||
|
||||
// pdpt页表项为0
|
||||
if (*tmp == 0)
|
||||
return 0;
|
||||
|
||||
// 读取pdt页表项
|
||||
tmp = phys_2_virt(((ul *)(*tmp & (~0xfffUL)) + (((ul)(virt_addr) >> PAGE_2M_SHIFT) & 0x1ff)));
|
||||
|
||||
// pde页表项为0
|
||||
if (*tmp == 0)
|
||||
return 0;
|
||||
|
||||
if (*tmp & (1 << 7))
|
||||
{
|
||||
// 当前为2M物理页
|
||||
return true;
|
||||
}
|
||||
else
|
||||
{
|
||||
// 存在4级页表
|
||||
tmp = phys_2_virt(((ul *)(*tmp & (~0xfffUL)) + (((ul)(virt_addr) >> PAGE_4K_SHIFT) & 0x1ff)));
|
||||
if (*tmp != 0)
|
||||
return true;
|
||||
else
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief 检测是否为有效的2M页(物理内存页)
|
||||
*
|
||||
* @param paddr 物理地址
|
||||
* @return int8_t 是 -> 1
|
||||
* 否 -> 0
|
||||
*/
|
||||
int8_t mm_is_2M_page(uint64_t paddr)
|
||||
{
|
||||
if (likely((paddr >> PAGE_2M_SHIFT) < mm_total_2M_pages))
|
||||
return 1;
|
||||
else
|
||||
return 0;
|
||||
}
|
@ -1,28 +1,77 @@
|
||||
#include "mm.h"
|
||||
#include "slab.h"
|
||||
#include "internal.h"
|
||||
|
||||
/**
|
||||
* @brief 获取一块新的vma结构体,并将其与指定的mm进行绑定
|
||||
*
|
||||
*
|
||||
* @param mm 与VMA绑定的内存空间分布结构体
|
||||
* @return struct vm_area_struct* 新的VMA
|
||||
*/
|
||||
struct vm_area_struct * vm_area_alloc(struct mm_struct *mm)
|
||||
struct vm_area_struct *vm_area_alloc(struct mm_struct *mm)
|
||||
{
|
||||
struct vm_area_struct * vma = (struct vm_area_struct *)kmalloc(sizeof(struct vm_area_struct),0);
|
||||
if(vma)
|
||||
struct vm_area_struct *vma = (struct vm_area_struct *)kmalloc(sizeof(struct vm_area_struct), 0);
|
||||
if (vma)
|
||||
vma_init(vma, mm);
|
||||
return vma;
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief 释放vma结构体
|
||||
*
|
||||
*
|
||||
* @param vma 待释放的vma结构体
|
||||
*/
|
||||
void vm_area_free(struct vm_area_struct *vma)
|
||||
{
|
||||
if(list_empty(&vma->list)) // 如果当前是剩余的最后一个vma
|
||||
if (vma->vm_prev == NULL && vma->vm_next == NULL) // 如果当前是剩余的最后一个vma
|
||||
vma->vm_mm->vmas = NULL;
|
||||
kfree(vma);
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief 将vma结构体插入mm_struct的链表之中
|
||||
*
|
||||
* @param mm 内存空间分布结构体
|
||||
* @param vma 待插入的VMA结构体
|
||||
* @param prev 链表的前一个结点
|
||||
*/
|
||||
void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma, struct vm_area_struct *prev)
|
||||
{
|
||||
struct vm_area_struct *next = NULL;
|
||||
vma->vm_prev = prev;
|
||||
if (prev) // 若指定了前一个结点,则直接连接
|
||||
{
|
||||
next = prev->vm_next;
|
||||
prev->vm_next = vma;
|
||||
}
|
||||
else // 否则将vma直接插入到给定的mm的vma链表之中
|
||||
{
|
||||
next = mm->vmas;
|
||||
mm->vmas = vma;
|
||||
}
|
||||
|
||||
vma->vm_next = next;
|
||||
|
||||
if (next != NULL)
|
||||
next->vm_prev = vma;
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief 将vma给定结构体从vma链表的结点之中删除
|
||||
*
|
||||
* @param mm 内存空间分布结构体
|
||||
* @param vma 待插入的VMA结构体
|
||||
*/
|
||||
void __vma_unlink_list(struct mm_struct *mm, struct vm_area_struct *vma)
|
||||
{
|
||||
struct vm_area_struct *prev, *next;
|
||||
next = vma->vm_next;
|
||||
prev = vma->vm_prev;
|
||||
if (prev)
|
||||
prev->vm_next = next;
|
||||
else // 当前vma是链表中的第一个vma
|
||||
mm->vmas = next;
|
||||
|
||||
if (next)
|
||||
next->vm_prev = prev;
|
||||
}
|
Loading…
x
Reference in New Issue
Block a user